Topic: 89 Johnson 9.9 cooling system obstruction – Page 2

This topic has 15 replies, 9 voices, and was last updated 9 years, 2 months ago by Casey Lynn.

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August 9, 2016 at 9:53 am #41826
billw
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If you haven’t actually lifted the block off of the mid section yet (From your post, it sounds that way) then the toughest fasteners, the ones that hold the exhaust tube onto the bottom of the power head, are yet to come…..

While the block is off, you might want to give your upper engine mounts a fore and aft yank and see if they are solid. Failure of those uppers is the other 9.9/15 common flaw.

Long live American manufacturing!
August 10, 2016 at 4:53 am #41862
seakaye12
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Courtesy of Leroy’s Ramblings….here’s a photo of the good spot to apply leverage to break the powerhead free.
August 10, 2016 at 12:09 pm #41864
fleetwin
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US Member
OK, well Leroy is surely prying in the right area, because it is the lower seal housing that makes these powerheads tough to remove.
But, he is playing with fire jamming a chisel between the powerhead and ex hsg mating surfaces, damage to both surfaces seems inevitable.
August 10, 2016 at 12:11 pm #41865
fleetwin
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US Member
quote BillW:

If you haven’t actually lifted the block off of the mid section yet (From your post, it sounds that way) then the toughest fasteners, the ones that hold the exhaust tube onto the bottom of the power head, are yet to come…..

While the block is off, you might want to give your upper engine mounts a fore and aft yank and see if they are solid. Failure of those uppers is the other 9.9/15 common flaw.

Excellent point….It may be easier to evaluate the mounts before removing the powerhead by rocking the powerhead fore and aft.
August 10, 2016 at 6:47 pm #41874
PugetSoundBoater
Participant
I got the powerhead off without damaging anything.Soaking the 4 exhaust tube bolts overnight with acetone/powersteering fluid,will use some heat removing those .The mounts you mention are at the top of the midsection, will check those out .Cleaning everything up today ,lubed the shift linkage.Anything else to check while i’m in there? As this is my first powerhead removal,your help has been great.

"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson
August 10, 2016 at 11:06 pm #41880
Casey Lynn
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US Member
Now is the best time to freshen up all the fuel lines, the overboard indicator line, and the carburetor may enjoy a good cleaning and fresh kit. The starter is already out of the way so it is an easy task.
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